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I've to do my whole project from scratch, and I'm ok with it, just don't want to do the same mistake ..
I've two tables, on is ( Jobs ) and ( Categories ) , I need to link the categories to the jobs, is it one-to-one relationship ? I want to link them together
so I Can do edit and delete and add jobs from my web-site using PHP
[Jobs Table]
+--------------+-------------+------+-----+-----------------+
| JobID | Name | description| numberOfJob |
+--------------+-------------+------+-----+-----------------+
| 0 | xxxx | xxxx | xxxx |
| 1 | xxxx | xxxx | xxxx |
+--------------+-------------+------+-----+-----------------+
[Categories Table]
+--------------+-------------+
| JobID | Name |
+--------------+-------------+
| 0 | xxxx |
| 1 | xxxx |
+--------------+-------------+
these are my tables, I would appreciate your help guys
Assuming Categories is a lookup table, and every job belongs to one category:
Jobs
----
JobID
CategoryID
JobName
JobDescription
JobNumber
Categories
---------
CategoryID
CategoryDescription
To display all data from Jobs table, your SQL would be:
SELECT * FROM Jobs
You could also sort the results by any column, such as:
SELECT * FROM Jobs ORDER BY JobDescription
...or show just certain data like so:
SELECT J.JobDescription, C.CategoryDescription
FROM Jobs J
LEFT JOIN Categories ON J.CategoryID = C.CategoryID
ORDER BY J.JobDescription
Related
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I have four different table. And invoice_id is foreign key in other table.
i want to show all records against invoice_id.
invoice_id | Bill_amount | Commission_amount | Payment_amount |
| | | |
2 | ------ | 1000 | 500 |
2 | ------ | 200 | 100 |
2 | ------ | -------------- | 100 |
2 | ------ | ------------ | 50 |
3 | 100 | 200 | -------- |
And So On........
Suppose you need 4 columns from 4 different tables. You can use left join if you want to include the empty records also from table2, table3 and table4.
Try the following query:
SELECT
table1.invoice_id,
table2.Bill_amount,
table3.Commission_amount,
table4.Payment_amount
FROM
table1
LEFT JOIN table2 ON table1.invoice_id = table2.invoice_id
LEFT JOIN table3 ON table1.invoice_id = table3.invoice_id
LEFT JOIN table4 ON table1.invoice_id = table4.invoice_id
WHERE
table1.invoice_id = '(your_required_id)';
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My table structure as fallows
+----+------+---------+---------+
| id | name | heading | catid |
+----+------+---------+---------+
| 1 | ajay | xyz | 1:25:22 |
| 2 |sanjay| abc |15:25:45 |
+----+------+---------+---------+
If i get condition catid=22 then get result
+---+-----+----+---------+
| 1 | ajay| xyz| 1:25:22 |
+---+-----+----+---------+
If i get condition catid=15 then get result
+---+-----+----+----------+
| 2 | sanjay| abc|15:25:45|
+---+-----+----+----------+
If i get condition catid=25 then get result
+---+-----+----+----------+
| 1 | ajay| xyz| 1:25:22 |
+---+-----+----+----------+
| 2 | sanjay| abc|15:25:45|
+---+-----+----+----------+
You could use FIND_IN_SET, after replacing the colons in catid with commas:
SELECT *
FROM yourTable
WHERE FIND_IN_SET('25', REPLACE(catid, ':', ',')) > 0;
But a good long term investment would be to normalize the catid data and get those IDs in separate records.
There is also a way to do this using the LIKE operator, but it is ugly:
SELECT *
FROM yourTable
WHERE CONCAT(':', catid, ':') LIKE '%:25:%';
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I have three tables and I would like to select from the tables without producing duplicates.
The table are as follows:
Customers
id | name | lastName
---------------------------------------
1 | john | doe
2 | helen | keller
Orders
The userID column is a foreign key that references John Doe, so John orders 3 items.
id | userID | order
---------------------------------------
1 | 1 | pizza
2 | 1 | pasta
3 | 1 | lasagna
CustomerRating
The userID column is a foreign key that references John Doe, so John leaves 5 reviews.
id | userID | rating | comment
-------------------------------------------------
1 | 1 | 5/5 | was good
2 | 1 | 5/5 | excellent
3 | 1 | 4/5 | great
4 | 1 | 4/5 | great
5 | 1 | 4/5 | great
How would I select from the 3 tables where I can get a return results that look like this?
id | name | lastName | order | rating
-----------------------------------------------------------------
1 | john | doe | pasta | 5/5
| | | pizza | 5/5
| | | lasagna | 4/5
| | | | 4/5
| | | | 4/5
I've tried joining these tables, but since John has left 5 reviews and only ordered 3 times, the id, name,lastName, and order columns gets filled with duplicate data.
Thanks!
I don't have any experience in MySQL but I assume that it works similar to MSSQL.
So the format in which you are expecting the output is not possible. You can rather get the order and rating column values as comma separated
Here is a similar kind of question that might help you
including example based on link
try something like this
SELECT Customers.id, Customers.name, Customers.lastName,
GROUP_CONCAT(Orders.order) OrderedDishes,
GROUP_CONCAT(CustomerRating.rating) RatingsGiven
FROM
..... rest of your query .....
There are ways to discard duplicates (SELECT DISTINCT, UNION, GROUP BY) but it is not clear whether users update existing rating or create new ones. And what you want to see: the last rating or the average one
On the other note - i would change your entire setup:
order table would contain order_id, customer_idand other order related stuff like order_date
products table that would describe each of your dishes and their info like price, description etc
order_products table with fields order_id and prduct_id
if users rate products then your rating table would need at least product_id, customer_id, rate_value. I'd also add ratingDate That way you can get averages or select the last one by Max(ratingDate)
I think you need to add an orderID field to the CustomerRating table else there is no way to relate an item to its rating.
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I want to built a system where users list their used books. I have built two independent tables and a lookup table to match the users with their listed books.
Login/Register system is completed. A CRUD system for the books was also built.
Now I want to give edit/delete permission only to the book owner but I have no idea how to match them w/o problem. How can I do that?
user_table
----------------------------
| UserID | Username | ... |
----------------------------
| 1001 | Deniz | ... |
----------------------------
| .... | ..... | ... |
----------------------------
book_table
----------------------------
| BookID | Bookname | ... |
----------------------------
| 5123 | SQL NOW | ... |
----------------------------
| ... | ... | ... |
----------------------------
user_book_table
--------------------
| UserID | BookID |
--------------------
| 1001 | 5123 |
--------------------
| ... | ... |
--------------------
SELECT * FROM user_table AS u, book_table AS b
LEFT JOIN user_book_table USING(UserID)
WHERE u.UserID = 1001
AND b.BookID = 5123;
With this structure you can simply check if the book is owned by a user. If so, he/she may edit the book.
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how to use multi-keywords search with php and mysql ?
I have a product table like this
the keywords field is save the keyword id
| id | name | keyword_ids |
|112 | apple | 123,12,421,121|
|113 | phone | 23,14,12,1 |
and the keyword table like this
|id | name |
|1 | white |
|2 | eat |
I want use a product keywords field find the similar product, how can I do it?
If you're set on using this data structure, you can use FIND_IN_SET
SELECT * FROM `products` p
LEFT JOIN `keyword` k ON FIND_IN_SET(k.`id`, p.`keyword_ids`)
WHERE k.`name` IN (?,?,?)
What I'd recommend doing is actually from a many-to-many relation table linking a product to keywords eg:
product_has_keyword
product_id | keyword_id
------------------------
112 | 123
112 | 12
112 | 421
112 | 121
That way you can use index for a join (which will be much faster)